Warhammer 40K: Space Marine may be pushing its meaty shoulders into retail this coming week, but its co-op mode won't arrive until "early October" says THQ. The mode, with the Latin-derived name "Exterminatus," will be made free as a download to "all players" according to THQ's release.

Exterminatus contains two separate "scenarios" in which four-player groups can maneuver their bulky trio of classes around, chainsawing through everything in their path. Global leaderboards are also included, posing "dynamic challenges" to players and supporting additional "score modifiers"

I'm guessing deadline caused this to not be included out of the box...

This is like.. £15 new now. Sad thing for a game to be so cheap, so quickly, without it being a promo. I was going to get it purely because a colleague's husband is somewhere in the credits, felt obliged - but meh. It looks like you really have to like warhammer in general to like the game? I may be wrong! It happens.